As Russ runs, his knee joint passes through the following vertical positions (meters): A. Frame 1: 0.067
B. Frame 2: 0.133
C. Frame 3: 0.212
D. Frame 4: 0.369
E. Frame 5: 0.439 The data were collected at a frequency of 100Hz (i. e. 100 frames per second - think about how this can be used to determine the time). What was the vertical acceleration of his knee joint at the third time point

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

Because the sun is the biggest and if the sun orbits the earth we will be dead probably

Answer the above statement is ( false );

The independent variable in this experiment is the angle at which the light from the ray box strikes the mirror.hope this .